package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.IService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMappre;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;


import java.util.List;
import java.util.stream.Collectors;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMappre, Setmeal> implements SetmealService {


    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 新增套餐，同时需要保存套餐和菜品的关联关系
     *
     * @param setmealDto
     */
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息,操作setmeal,执行insert操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();

        setmealDishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());
        //保存菜品和套餐的关联信息,操作setmeal_dish,执行insert操作
        setmealDishService.saveBatch(setmealDishes);


    }


    /**
     * 删除套餐,同事需要删除套餐和菜品关联数据
     *
     * @param ids
     */
    @Transactional
    public void removeWithDish(List<Long> ids) {

        //查询套餐状态,查看是否可以删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId, ids);
        queryWrapper.eq(Setmeal::getStatus, 1);

        int count = this.count(queryWrapper);
        if (count > 0) {
            //如果不能删除抛出一个异常
            throw new CustomException("套餐正在售卖中,不能删除");
        }

        //如果可以删除先删除套餐中的数据---setmeal
        this.removeByIds(ids);

        LambdaQueryWrapper<SetmealDish> labdaQueryWrap = new LambdaQueryWrapper<>();
        labdaQueryWrap.in(SetmealDish::getSetmealId,ids);
        //删除关系表中的数据/setmeal_dish
        setmealDishService.remove(labdaQueryWrap);
    }
}
